Use StringBuilder instead of appending Strings

wizard-server/src/main/java/org/cobbzilla/wizard/dao/AbstractCRUDDAO.java

@@ -342,17 +342,16 @@ public abstract class AbstractCRUDDAO<E extends Identifiable>
     private int bulkDelete(@NonNull final String field, @Nullable final Object value, final boolean notUuid) {
         if (value == null) return bulkDeleteWhere(field + " IS NULL");
 
-
-        String condition = field + " = :" + field;
+        final StringBuilder condition = new StringBuilder(field).append(" = :").append(field);
         final HashMap<String, Object> params = new HashMap<>();
         params.put(field, value);
 
         if (notUuid) {
-            condition += " AND uuid != :" + EX_UUID;
+            condition.append(" AND uuid != :").append(EX_UUID);
             params.put(EX_UUID, value);
         }
 
-        return bulkDeleteWhere(condition, params);
+        return bulkDeleteWhere(condition.toString(), params);
     }
 
     public int bulkDeleteWhere(@NonNull final String whereClause) {